@matigo It’s also not uncommon to earth to plumbing. (Possibly even required, to avoid an arc due to differential in voltage if current starts grounding out the ground spike.)
Copper supply piping makes a great conductor. PEX piping, probably not so much. And PVC drain piping also won’t pose the problems of cast iron drain piping. So, new materials have made plumbing safer from an electrical standpoint.
/@sumudu @variablepulserate